US20230246570A1 - Control device for an inverter, electric drive system and method for establishing a safe operating mode - Google Patents

Control device for an inverter, electric drive system and method for establishing a safe operating mode Download PDF

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Publication number
US20230246570A1
US20230246570A1 US17/927,396 US202117927396A US2023246570A1 US 20230246570 A1 US20230246570 A1 US 20230246570A1 US 202117927396 A US202117927396 A US 202117927396A US 2023246570 A1 US2023246570 A1 US 2023246570A1
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US
United States
Prior art keywords
rotational speed
inverter
drive system
electric machine
safe operating
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Pending
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US17/927,396
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English (en)
Inventor
Edwin Eberlein
Daniel Raichle
Manfred Kirschner
Thomas Merkel
Thomas Knorpp
Volker Gilgenbach
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Robert Bosch GmbH
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Robert Bosch GmbH
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Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EBERLEIN, EDWIN, GILGENBACH, VOLKER, MERKEL, THOMAS, RAICHLE, DANIEL, KIRSCHNER, MANFRED, KNORPP, THOMAS
Publication of US20230246570A1 publication Critical patent/US20230246570A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
    • H02P3/22—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor by short-circuit or resistive braking
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the present invention relates to a control device for an inverter, an electric drive system, and a method for establishing a safe operating mode in an electric drive system.
  • Electric drive systems are becoming increasingly important.
  • electric drive systems are found in wholly or at least partially electrically driven vehicles.
  • it is necessary to establish a safe operating mode in the event of a fault, in particular in the case of a fault in the control of the inverter in such a drive system.
  • a safe operating mode for example, an active short-circuit or what is known as a freewheeling mode are known as such safe operating modes.
  • phase connections of the electric machine are electrically short-circuited by means of the switching elements in the inverter.
  • all switching elements of the inverter may be opened so that the phase connections of the electric machine are not electrically connected to one another.
  • the publication DE 10 2011 081 173 A1 describes an operating mode circuit for inverters and a method for establishing operating modes in an inverter.
  • it is in particular proposed to switch to a freewheeling mode as a safe operating mode in the inverter if a rotational speed of the electric machine is less than a predetermined rotational speed threshold value, and to switch the inverter into an active short-circuit if the determined rotational speed of the electric machine is greater than or equal to a predetermined threshold rotational speed.
  • the present invention discloses a control device for an inverter in an electric drive system, an electric drive system, and a method for establishing a safe operating mode in an electric drive system, with the features of the independent claims. Further advantageous embodiments are the subject matter of the dependent claims.
  • a control device for an inverter in an electric drive system having a first control path and a second control path.
  • the first control path and the second control path are each designed to establish a safe operating mode in the inverter of the electric drive system.
  • the first control path comprises a first safety device.
  • the first safety device is designed to determine a rotational speed of the electric machine of the electric drive system.
  • the first safety device is designed to establish either an active short-circuit or a freewheeling mode in the inverter using the determined rotational speed of the electric machine.
  • the second control path comprises a second safety device.
  • the second safety device is designed to determine the rotational speed of the electric machine in the electric drive system.
  • the second safety device is designed to establish either an active short-circuit or a freewheeling mode in the inverter using the rotational speed of the electric machine determined by the second safety device.
  • an electric drive system having an electric machine, an inverter which is designed to control the electric machine, and a control device according to the invention for the inverter.
  • the method comprises a first determination of a rotational speed of an electric machine of the electric drive system, and a first establishment of a safe operating mode in the electric machine by means of a first control path.
  • the establishment of the safe operating mode in this case takes place using the determined rotational speed.
  • either an active short-circuit or a freewheeling mode is established in the inverter of the electric drive system.
  • the method comprises a second determination of a rotational speed of the electric machine of the electric drive system, and a second establishment of a safe operating mode in the electric machine.
  • the second determination of the rotational speed and the second establishment of the safe operating mode in this case take place by means of a second control path.
  • Analogous to the first establishment of the safe operating mode the second establishment of the safe operating mode also takes place using the determined rotational speed, wherein either an active short-circuit or a freewheeling mode is established in the inverter of the electric drive system.
  • the present invention is based on the finding that different safe operating modes are advantageous depending on a rotational speed of the electric machine in an electric drive system. Therefore, a rotational speed-dependent selection of the relevant suitable safe operating mode may be advantageous. It is a further finding of the present invention that, in the event of a fault of a conventional system, it may be possible that sufficient information about the rotational speed of the electric machine is not present, or the evaluation of the rotational speed information cannot take place in a suitable manner.
  • a relevant suitable safe operating mode may be established even if a fault occurs in one of the two control paths. In this way, for example, it may be ensured that potentially dangerous voltage peaks in the electric drive system are avoided. The occurrence of unwanted high electric currents may also be avoided by a suitable selection of the relevant safe operating mode. Moreover, by means of a redundant implementation of rotational speed-dependent operating modes, it is also possible to prevent the establishment of an operating mode which would possibly result in an undesirably high decelerating torque.
  • the first safety device and/or the second safety device are designed to establish an active short-circuit in the inverter in the event that the determined rotational speed of the electric machine exceeds a first threshold value. Additionally or alternatively, the respective safety devices can establish a freewheeling mode in the event that the determined rotational speed of the electric machine falls below a second threshold value.
  • the second threshold value may be greater than the first threshold value.
  • An active short-circuit may lead to an active braking torque of the electric machine.
  • Such a braking torque may lead to a strong deceleration, in particular at low rotational speeds, which may lead, for example in the case of electric vehicles, to losses of traction and thus dangerous driving situations.
  • undesirably high voltage peaks may occur in the freewheeling mode, which may lead to dangerous states within the drive system, in particular within the voltage converter.
  • the control device is designed to control an inverter having a plurality of half-bridges. Normally, a half-bridge having an upper switching element and a lower switching element is provided in the inverter for each phase of an electric machine.
  • the first safety device and the second safety device may be designed to control the switching elements in the individual half-bridges, using phase currents in the corresponding phases, for the establishment of a freewheeling mode. This way, it may be ensured that, in the transition into the freewheeling mode, a brief overvoltage in the intermediate circuit capacitor of the inverter does not occur even in the absence of a connection to an electrical energy source such as, for example, the traction battery in an electric vehicle.
  • phase currents in the individual phases may be detected and monitored.
  • the individual switching elements may thus be controlled at a zero crossing, or close to the zero crossing, of the corresponding phase current, wherein the control to establish a freewheeling mode comprises in particular the opening of the switching elements in the corresponding half-bridge.
  • the first safety device and/or the second safety device are designed to control the switching elements in the individual half-bridges, using phase voltages in the corresponding phases, for the establishment of an active short-circuit.
  • the corresponding switching elements may be activated to form a phase angle in which the current would be assumed by the corresponding switching element even in a stationary operation. An excessive increase of the phase current, with a correspondingly high loading of the relevant switch, may be avoided in this case.
  • a detected voltage-time surface of the relevant phase may be taken into account for the determination of a suitable point in time for controlling the respective switching elements.
  • the switching elements in a half-bridge may thus be switched if the voltage-time surface of the corresponding phase reaches half of its maximum value. If applicable, switching may also take place earlier, since this has no influence due to the negative current direction.
  • the first safety device is designed to verify the determined rotational speed of the electric machine using the rotational speed determined by the second safety device.
  • the redundant detection of the rotational speed of the electric machine by means of the first safety device and the second safety device thus enables functional testing of the individual components during operation.
  • a malfunction of the rotational speed determination may be perceived by comparing the rotational speeds determined in the safety devices.
  • the second safety device may also verify the determined rotational speed using the rotational speed determined by the first safety device.
  • the first control path is designed to be fed from a low-voltage side of the electric drive system.
  • the second control path may be designed to be fed from a high-voltage side of the electric drive system. In this way, a high independence of the two control paths may be realized. For example, even in the event of a failure of the supply voltage on the low-voltage side, and thus a complete failure of the first control path, a safe operating mode, in particular a rotational speed-dependent safe operating mode, can be established by means of the second control path.
  • the second safety device is designed to establish the freewheeling mode as a safe operating mode in the event that an intermediate circuit voltage of the inverter falls below a predetermined first threshold voltage.
  • the freewheeling mode may be selected as a safe operating mode even if an active short-circuit should be selected due to the determined rotational speed.
  • the intermediate circuit voltage may be increased by briefly establishing the freewheeling mode, and thus an energy supply to the second control path may be ensured.
  • the second safety device is designed to establish the active short-circuit as a safe operating mode in the event that the intermediate circuit voltage of the inverter exceeds a predetermined second threshold voltage and the determined rotational speed is greater than the first threshold value. Dangerous voltage excesses at the intermediate circuit capacitor may be avoided as a result.
  • the second threshold voltage may be set such that the intermediate circuit voltage is always less than an electrical voltage of an energy source which may be connected to the intermediate circuit capacitor, for example the traction battery of an electric vehicle.
  • the second safety device is designed to determine the rotational speed of the electric machine during the active short-circuit using forward voltages through the switching elements in the inverter.
  • the forward voltage of switching elements which establish the active short-circuit that is to say which are closed during the active short-circuit, may be used in this case.
  • the rotational speed of the electric machine may therefore be determined on the high-voltage side without additional components.
  • the second safety device is designed to determine the rotational speed of the electric machine during the freewheeling mode using at least two phase voltages of the electric machine.
  • at least two phase voltages may be evaluated with respect to a predetermined reference potential.
  • the rotational speed of the electric machine may thus also be determined on the high-voltage side without additional components during the freewheeling mode.
  • FIG. 1 is a schematic view of a block diagram of an electric drive system according to an embodiment
  • FIG. 2 is a schematic view of the profile of a braking torque over the rotational speed during an active short-circuit
  • FIG. 3 is a schematic view of a block diagram of a safety device for a control device according to an embodiment
  • FIG. 4 is a workflow diagram, as forms the basis of a method for establishing a safe operating mode according to an embodiment.
  • FIG. 1 is a schematic view of a block diagram of an electric drive system according to an embodiment.
  • the electric drive system may be, for example, the electric drive system of a wholly or at least partially electrically driven vehicle.
  • the electric drive system may be fed by an electrical energy store 1 , for example a traction battery of an electric vehicle.
  • the energy provided by the electrical energy store 1 may be provided at the input terminal of an inverter arrangement 2 , optionally via a battery isolation switch 1 a .
  • the inverter arrangement 2 may comprise, for example, an inverter 30 having a plurality of switching elements.
  • an intermediate circuit capacitor 31 may be provided at the input terminal of the inverter 30 .
  • An output terminal of the inverter arrangement 2 in particular at the output terminal of the inverter 30 , may be connected to an electric machine 3 .
  • the arrangement depicted here having a three-phase electric machine 3 serves only as an example for better comprehension. Of course, electric machines 3 having any other number of electrical phases are also possible.
  • the inverter 30 can comprise, for example, for each phase of the electric machine 3 , a half-bridge having an upper switching element H 1 , H 2 , H 3 and a lower switching element L 1 , L 2 , L 3 .
  • the inverter 30 in particular the switching elements in the inverter 30 , may be controlled by means of control signals from a control device in a first control path 10 .
  • control signals from a control device in a first control path 10 .
  • setpoint value specifications and possibly also sensor signals of operating variables of the drive system may be received in the control device, for example.
  • the control device may generate suitable control signals for controlling the upper switching elements H 1 , H 2 , H 3 and the lower switching elements L 1 , L 2 , L 3 .
  • the control device in the first control path 10 may, for example, be a main computer which, during operation of the electric drive system, transmits the required operating parameters and generates the suitable control signals for controlling the inverter 30 .
  • a safe operating mode in the electric drive system, in particular in the inverter 30 .
  • This safe operating mode may be, for example, what is known as a freewheeling mode, in which all switching elements H 1 , H 2 , H 3 and L 1 , L 2 , L 3 of the inverter 30 are open.
  • an active short-circuit may be established as a safe operating mode, in which the phase connections of the electric machine 3 are electrically connected to one another by means of the upper switching elements H 1 , H 2 , H 3 or the lower switching elements L 1 , L 2 , L 3 .
  • the selection as to whether the freewheeling mode or the active short-circuit is established as a safe operating mode may be determined depending on the current rotational speed of the electric machine 3 .
  • a first safety device 11 which determines the rotational speed of the electric machine 3 may be provided in the first control path 10 .
  • This determined rotational speed may be used for the decision as to whether the active short-circuit or the freewheeling mode is to be established as a safe operating mode.
  • a threshold value for the rotational speed may be established and, in the event that the rotational speed exceeds this threshold value, the active short-circuit is established as a safe operating mode. Below this threshold value, the freewheeling mode may be established as a safe operating mode.
  • a hysteresis may be provided for the change between the active short-circuit and the freewheeling mode.
  • a first threshold value n 1 may be provided which, if exceeded, induces a change from freewheeling mode into the active short-circuit.
  • a second threshold value n 2 may also be provided which, if fallen below, induces a change from the active short-circuit into the freewheeling mode.
  • the rotational speed for the first threshold value n 1 may be smaller than the rotational speed for the second threshold value n 2 .
  • FIG. 2 is a schematic diagram for the profile of a braking torque M of the electric machine 3 as a function of the rotational speed n during an active short-circuit.
  • the active short-circuit may cause a strong braking torque, in particular at low rotational speeds.
  • a strong braking torque may, for example, lead to the loss of traction between the wheels and the roadway in electric vehicles.
  • the active short-circuit is only established at higher rotational speeds, whereas at lower rotational speeds the freewheeling mode is established as the safe operating mode.
  • FIG. 1 is a schematic diagram for the profile of a braking torque M of the electric machine 3 as a function of the rotational speed n during an active short-circuit.
  • a hysteresis described above may be provided between the rotational speed for the first threshold value n 1 and the rotational speed for the second threshold value n 2 .
  • either the first threshold value n 1 or the second threshold value n 2 may be used for the decision as to whether the active short-circuit or the freewheeling mode is to be established.
  • any other approaches for example with a rotational speed in the range between n 1 and n 2 , are also possible in principle.
  • the electrical voltages and currents in the inverter 30 may be taken into account for the first establishment of a safe operating mode in the freewheeling mode or active short-circuit, and also for the change between the active short-circuit and the freewheeling mode.
  • a point in time which suitably avoids an excessive increase of electrical voltages and/or currents may be provided in this case for the opening or closing of the individual switching elements. For example, it may be advantageous to open a switching element at a zero crossing of the electric current or at least close to the zero crossing, in order to avoid voltage spikes.
  • first control path 10 for the control of the inverter 30 , the establishment of the safe operating mode, and in particular the rotational speed-dependent change between the active short-circuit and the freewheeling mode, may also be realized only via the first safety device 11 .
  • an additional component may optionally be provided which, in the case of a complete failure of the first control path 10 , establishes a fixedly predetermined safe operating mode, for example an active short-circuit. In this instance, however, no rotational speed-dependent establishment of the safe operating mode would be possible in the case of a failure of the first control path 10 .
  • a second control path 20 having a second safety device 21 is provided in the electric drive system according to FIG. 1 .
  • This second safety device 21 can also determine the rotational speed of the electric machine 3 and, as necessary, in particular in the event of a fault, can establish a rotational speed-dependent safe operating mode in the inverter arrangement 2 , in particular in the inverter 30 .
  • the concept of the rotational speed-dependent establishment of a safe operating mode corresponds to the greatest possible extent to the previously described approach for establishing the freewheeling mode or the active short-circuit depending on the current rotational speed of the electric machine 3 .
  • the first control path 10 may be fed by a low-voltage network, for example.
  • a low-voltage network is, for example, a power supply which is separate or independent from the energy source 1 .
  • the voltage level of the low-voltage network may be lower than the voltage level of a high-voltage network with the energy source 1 which feeds the electric drive system.
  • the second control path 20 may, for example, be fed from the high-voltage side of the electric drive system. In this way, a safe operating mode can continue to be established by means of the second safety device 21 in the second control path 20 , even in the case of failure or a malfunction on the low-voltage side of the electric drive system.
  • FIG. 3 is a schematic view of a block diagram of a safety device 20 according to an embodiment.
  • the safety device 21 can detect, for example, the electric voltages U_ph at the phase connections of the electric machine 3 .
  • a first evaluation device 22 can evaluate these phase voltages U_ph, in particular in freewheeling mode, and determine the rotational speed of the electric machine 3 using the phase voltage U_ph.
  • the phase currents I_ph may be provided at the second safety device 21 .
  • a second evaluation device 22 may detect the phase currents I_ph and determine the rotational speed of the electric machine 3 on the basis of said phase currents I_ph.
  • the determination of the rotational speed may take place on the basis of the phase currents I_ph in the active short-circuit.
  • the determined rotational speed from the first evaluation device 22 and/or the second evaluation device 23 may be provided to a processing device 25 . Therefore, the processing device 25 may in each case determine a suitable safe operating mode depending on the rotational speed and, as necessary, accordingly control the switching elements H 1 , H 2 , H 3 , L 1 , L 2 , L 3 in the inverter 30 .
  • the safety device 21 may monitor the intermediate circuit voltage U_IC of the intermediate circuit capacitor 31 in the second control path 20 .
  • the intermediate circuit voltage U_IC at the intermediate circuit capacitor 31 falls below a predetermined threshold voltage, a change into the freewheeling mode operation may be briefly effected even at high rotational speeds. As a result, the intermediate circuit capacitor 31 may be further charged. However, in order to avoid an excessive increase in the electrical voltage at the intermediate circuit capacitor 31 specifically at higher rotational speeds, it is possible to change back into the active short-circuit if a second threshold voltage is exceeded.
  • the second threshold voltage should preferably be lower than the electrical voltage provided by the electrical energy store 1 .
  • a voltage which corresponds to the synchronous generated voltage in the freewheeling mode at the switchover point for the rotational speed-dependent safe mode may be selected as a voltage value for the change from active short-circuit into the freewheeling mode.
  • the rotational speed of the electric machine 3 determined by the first safety device 11 and the rotational speed of the electric machine 3 determined by the second safety device 21 may be compared with one another during normal operation of the electric drive system. If a significant difference of the two determined rotational speeds is detected, this can provide an indication of a malfunction in at least one of the two safety devices.
  • FIG. 4 is a schematic view of a workflow diagram for a method for establishing a safe operating mode in an electric drive system.
  • the method may in principle comprise any steps as have already been previously described in conjunction with the electric drive system.
  • the electric drive system in particular the control device, may also comprise any suitable components as are described below in conjunction with the method.
  • the method comprises two parallel steps S 1 and S 2 .
  • Step S 1 is in this case executed by a first control path 10
  • step S 2 is executed by a second control path 20 .
  • the first control path 10 may be fed by a low-voltage network
  • the second control path 20 may be fed by a high-voltage network.
  • a determination S 11 of a rotational speed of the electric machine 3 takes place in step S 1 .
  • a safe operating mode of the electric machine may subsequently be established in step S 12 .
  • the safe operating mode may be established depending on the rotational speed, i.e. using the determined rotational speed.
  • an active short-circuit or a freewheeling mode in the inverter of the electric drive system may be established depending on the determined rotational speed.
  • step S 2 comprises a step S 21 for determining the rotational speed of the electric machine and a step S 22 for establishing a safe operating mode.
  • the safe operating mode may also be established using the rotational speed determined in step S 21 , wherein either a freewheeling mode or an active short-circuit may be established as a safe operating mode, depending on the rotational speed.
  • the present invention relates to the establishment of a rotational speed-dependent safe operating mode.
  • two redundant control paths are provided which may each establish either an active short-circuit or a freewheeling mode as a safe operating mode, depending on the rotational speed.
  • a rotational speed-dependent safe operating mode may still be fully established even in the case of a failure of a control path.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
US17/927,396 2020-05-25 2021-04-30 Control device for an inverter, electric drive system and method for establishing a safe operating mode Pending US20230246570A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102020206478.4A DE102020206478A1 (de) 2020-05-25 2020-05-25 Steuervorrichtung für einen Stromrichter, elektrisches Antriebssystem und Verfahren zum Einstellen eines sicheren Betriebszustandes
DE102020206478.4 2020-05-25
PCT/EP2021/061410 WO2021239386A1 (de) 2020-05-25 2021-04-30 Steuervorrichtung für einen stromrichter, elektrisches antriebssystem und verfahren zum einstellen eines sicheren betriebszustandes

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EP (1) EP4158769A1 (zh)
CN (1) CN115552787A (zh)
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WO (1) WO2021239386A1 (zh)

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DE102021201858A1 (de) 2021-02-26 2022-09-01 Vitesco Technologies Germany Gmbh Verfahren und Steuereinheit zur Umschaltung eines Elektroantriebs zwischen einem Betriebsmodus mit aktivem Kurzschluss und einem Freilauf-Betriebsmodus
CN116330976A (zh) * 2021-12-24 2023-06-27 北京车和家汽车科技有限公司 电驱动系统的安全控制方法、装置、设备及存储介质
DE102022113800B4 (de) 2022-06-01 2024-06-06 Audi Aktiengesellschaft Verfahren zum Betrieb einer elektrischen Maschine, insbesondere in einem Kraftfahrzeug, und Kraftfahrzeug
DE102022004264A1 (de) 2022-11-18 2023-01-05 Mercedes-Benz Group AG Verfahren zum Betrieb eines Stromrichters

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DE29813080U1 (de) * 1998-07-22 1998-10-15 Siemens AG, 80333 München Schutzeinrichtung gegen Spannungsrückwirkung permanenterregter elektrischer Antriebe
EP2600492B1 (de) * 2011-12-01 2015-05-06 AEG Power Solutions GmbH Anordnung zur unterbrechungsfreien Stromversorgung
DE102011081173A1 (de) 2011-08-18 2013-02-21 Robert Bosch Gmbh Betriebszustandsschaltung für Wechselrichter und Verfahren zum Einstellen von Betriebszuständen eines Wechselrichters
EP3151413B1 (de) * 2015-10-02 2018-04-18 GE Energy Power Conversion Technology Ltd Steuervorrichtung und steuerverfahren für grosse stromrichter

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DE102020206478A1 (de) 2021-11-25

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